ACPICA: Optimize execution of AML While loops
Previously, a control state object was allocated and freed for each execution of the loop. The optimization is to simply reuse the control state for each iteration. This speeds up the raw loop execution time by about 5%. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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1 changed files with 25 additions and 4 deletions
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@ -1140,9 +1140,28 @@ acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
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op->common.aml_opcode, walk_state));
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switch (op->common.aml_opcode) {
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case AML_IF_OP:
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case AML_WHILE_OP:
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/*
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* If this is an additional iteration of a while loop, continue.
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* There is no need to allocate a new control state.
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*/
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if (walk_state->control_state) {
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if (walk_state->control_state->control.aml_predicate_start
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== (walk_state->parser_state.aml - 1)) {
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/* Reset the state to start-of-loop */
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walk_state->control_state->common.state =
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ACPI_CONTROL_CONDITIONAL_EXECUTING;
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break;
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}
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}
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/*lint -fallthrough */
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case AML_IF_OP:
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/*
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* IF/WHILE: Create a new control state to manage these
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* constructs. We need to manage these as a stack, in order
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@ -1248,8 +1267,13 @@ acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
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/* Predicate was true, go back and evaluate it again! */
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status = AE_CTRL_PENDING;
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walk_state->aml_last_while =
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walk_state->control_state->control.aml_predicate_start;
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break;
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}
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/* Predicate was false, terminate this while loop */
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
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"[WHILE_OP] termination! Op=%p\n", op));
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@ -1257,9 +1281,6 @@ acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
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control_state =
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acpi_ut_pop_generic_state(&walk_state->control_state);
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walk_state->aml_last_while =
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control_state->control.aml_predicate_start;
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acpi_ut_delete_generic_state(control_state);
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break;
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